Claude Code 2.1.267 adds a hard effort ceiling and a flag that stops reusing the recorded system prompt
The September 9 release adds `maxEffortLevel`, settable top-level or per model under `modelSettings`, capping effort on every provider including Bedrock, Vertex and Foundry while still letting users choose lower, and `--system-prompt-snapshot off`, which re-renders the system prompt on every request instead of replaying the conversation's recorded one, aimed at iterating on prompt text. The same entry fixes a batch of prompt-cache breaks: switching models with /model re-sending every tool definition, mid-session MCP and plugin tools rewriting the tool list, resumed sessions re-rendering tool descriptions, and a background worker injecting EnterWorktree mid-session. There is also a security fix where a marketplace entry path containing a backslash could bypass the containment check on macOS and Linux.
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